Getting an error trying to write to file

Question

I am getting this error at openFileOutput(FILENAME, Context.MODE_PRIVATE);

I used this code before, I don't know why it's not working now. The error reads: Method openFileOutput(String, int) is undefined for the type SaveProjects

package com.example.musicvideomaker;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.OutputStreamWriter;
import java.util.ArrayList;

import android.content.Context;
import android.util.Log;

import com.example.musicvideomaker.Projects;

public class SaveProjects {

FileOutputStream fos;

public ArrayList<Projects> Projects;


public void saveProject(Projects project, String FILENAME)
{
    this.Projects.add(project);
    try
    {
    fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
    ObjectOutputStream os = new ObjectOutputStream(fos);
    os.writeObject(this);
    os.close();
    }
    catch (FileNotFoundException e)
    {
        e.printStackTrace();
    }
}

}

you have moved the method `saveProject` from an activity to this new class, and `openFileOutput` is a method of `Context`. You need to pass a `Context` as a parameter, and call `openFileOutput` on it. — njzk2, Jul 02 '14 at 18:47
A syntax error shows up. The red underline is under openFileOutput — user3798867, Jul 02 '14 at 18:48
@user3798867 check this link http://stackoverflow.com/a/3626033/3469370 To this method you can pass your Service or Activity — empr777, Jul 02 '14 at 18:52
I created a new projects and it works. This project can't find the context at all. — user3798867, Jul 02 '14 at 19:15

aProperFox · Answer 1 · 2014-07-02T18:54:21.357

Since you're not in an activity, you need to use the Context to call "openFileOutput". Although your Context would either need to be statically declared in an Application file, or if you call the SaveProject class from an Activity, you could pass in the context as a parameter of the class (although it is bad practice). Then you could try this:

public class SaveProjects {

private Context context;

FileOutputStream fos;


public ArrayList<Projects> Projects;

public SaveProjects(Context context) {
    this.context = context;
}

public void saveProject(Projects project, String FILENAME)
{
    this.Projects.add(project);
    try
    {
    fos = context.openFileOutput(FILENAME, Context.MODE_PRIVATE);
    ObjectOutputStream os = new ObjectOutputStream(fos);
    os.writeObject(this);
    os.close();
    }
    catch (FileNotFoundException e)
    {
        e.printStackTrace();
    }
}

}

Thanks. I was getting ahead of myself when I gave the first line of code, assuming OP would understand everything else about Context. — aProperFox, Jul 02 '14 at 19:25

Getting an error trying to write to file

1 Answers1